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Einar Naumann (1891-1934), an influential Swedish limnologist who was the author of many diverse limnological studies (297 publications) and founded the Institute of Limnology at the University of Lund in 1929. Along with Thieneman he worked on lake typology and founded the oligo-eutrophic lake classification scheme. Photo from old ASLO slide collection submitted by W. Lewis; scanned by K.L. Schulz.